<?php
// $Id: textsanitizer.php 184 2006-01-22 22:34:51Z skalpa $
//  ------------------------------------------------------------------------ //
//                XOOPS - PHP Content Management System                      //
//                    Copyright (c) 2000 XOOPS.org                           //
//                       <http://www.xoops.org/>                             //
//  ------------------------------------------------------------------------ //
//  This program is free software; you can redistribute it and/or modify     //
//  it under the terms of the GNU General Public License as published by     //
//  the Free Software Foundation; either version 2 of the License, or        //
//  (at your option) any later version.                                      //
//                                                                           //
//  You may not change or alter any portion of this comment or credits       //
//  of supporting developers from this source code or any supporting         //
//  source code which is considered copyrighted (c) material of the          //
//  original comment or credit authors.                                      //
//                                                                           //
//  This program is distributed in the hope that it will be useful,          //
//  but WITHOUT ANY WARRANTY; without even the implied warranty of           //
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the            //
//  GNU General Public License for more details.                             //
//                                                                           //
//  You should have received a copy of the GNU General Public License        //
//  along with this program; if not, write to the Free Software              //
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA //
//  ------------------------------------------------------------------------ //
// Author: Kazumi Ono (http://www.myweb.ne.jp/, http://jp.xoops.org/)        //
//         Goghs Cheng (http://www.eqiao.com, http://www.devbeez.com/)       //
// Project: The XOOPS Project (http://www.xoops.org/)                        //
// ------------------------------------------------------------------------- //
// This is subset and modified version of module.textsanitizer.php
set_magic_quotes_runtime(0);

class TextSanitizer
{

	/*
	* Constructor of this class
	* Gets allowed html tags from admin config settings
	* <br> should not be allowed since nl2br will be used
	* when storing data
	*/
	function TextSanitizer()
	{

	}

	function &getInstance()
	{
		static $instance;
		if (!isset($instance)) {
			$instance = new TextSanitizer();
		}
		return $instance;
	}

	function makeClickable( $text )
	{
		$patterns = array("/([^]_a-z0-9-=\"'\/])([a-z]+?):\/\/([^, \r\n\"\(\)'<>]+)/i", "/([^]_a-z0-9-=\"'\/])www\.([a-z0-9\-]+)\.([^, \r\n\"\(\)'<>]+)/i", "/([^]_a-z0-9-=\"'\/])([a-z0-9\-_.]+?)@([^, \r\n\"\(\)'<>]+)/i");
		$replacements = array("\\1<a href=\"\\2://\\3\" target=\"_blank\">\\2://\\3</a>", "\\1<a href=\"http://www.\\2.\\3\" target=\"_blank\">www.\\2.\\3</a>", "\\1<a href=\"mailto:\\2@\\3\">\\2@\\3</a>");
		return preg_replace($patterns, $replacements, $text);
	}

	function nl2Br( $text )
	{
		return preg_replace("/(\015\012)|(\015)|(\012)/","<br />",$text);
	}

	function addSlashes( $text, $force = false )
	{
		if ( $force || !get_magic_quotes_gpc() ) {
			return addslashes( $text );
		}
		return $text;
	}

	/*
	* if magic_quotes_gpc is on, stirip back slashes
	*/
	function stripSlashesGPC($text)
	{
		return  ( get_magic_quotes_gpc() ? stripslashes($text) : $text );
	}

	/*
	*  for displaying data in html textbox forms
	*/
	function htmlSpecialChars( $text )
	{
		return preg_replace("/&amp;/i", '&', htmlspecialchars($text, ENT_QUOTES));
	}

	function undoHtmlSpecialChars( $text )
	{
		return preg_replace(array("/&gt;/i", "/&lt;/i", "/&quot;/i", "/&#039;/i"), array(">", "<", "\"", "'"), $text);
	}

	/*
	*  Filters textarea form data in DB for display
	*/
	function displayText( $text, $html = false )
	{
		if ( !$html ) {
			// html not allowed
			$text = $this->htmlSpecialChars($text);
		}
		$text = $this->makeClickable($text);
		$text = $this->nl2Br($text);
		return $text;
	}

	/*
	*  Filters textarea form data submitted for preview
	*/
	function previewText($text, $html=false)
	{
		return $this->displayText( $this->stripSlashesGPC($text), $html);
	}

##################### Deprecated Methods ######################

	function sanitizeForDisplay($text, $allowhtml = 0, $smiley = 1, $bbcode = 1)
	{
		if ( $allowhtml == 0 ) {
			$text = $this->htmlSpecialChars($text);
		} else {
			//$config =& $GLOBALS['xoopsConfig'];
			//$allowed = $config['allowed_html'];
			//$text = strip_tags($text, $allowed);
			$text = $this->makeClickable($text);
		}
		if ( $smiley == 1 ) {
			$text = $this->smiley($text);
		}
		if ( $bbcode == 1 ) {
			$text = $this->xoopsCodeDecode($text);
		}
		$text = $this->nl2Br($text);
		return $text;
	}

	function sanitizeForPreview($text, $allowhtml = 0, $smiley = 1, $bbcode = 1)
	{
		$text = $this->oopsStripSlashesGPC($text);
		if ( $allowhtml == 0 ) {
			$text = $this->htmlSpecialChars($text);
		} else {
			//$config =& $GLOBALS['xoopsConfig'];
			//$allowed = $config['allowed_html'];
			//$text = strip_tags($text, $allowed);
			$text = $this->makeClickable($text);
		}
		if ( $smiley == 1 ) {
			$text = $this->smiley($text);
		}
		if ( $bbcode == 1 ) {
			$text = $this->xoopsCodeDecode($text);
		}
		$text = $this->nl2Br($text);
		return $text;
	}

	function makeTboxData4Save($text)
	{
		//$text = $this->undoHtmlSpecialChars($text);
		return $this->addSlashes($text);
	}

	function makeTboxData4Show($text, $smiley=0)
	{
		$text = $this->htmlSpecialChars($text);
		return $text;
	}

	function makeTboxData4Edit($text)
	{
		return $this->htmlSpecialChars($text);
	}

	function makeTboxData4Preview($text, $smiley=0)
	{
		$text = $this->stripSlashesGPC($text);
		$text = $this->htmlSpecialChars($text);
		return $text;
	}

	function makeTboxData4PreviewInForm($text)
	{
		$text = $this->stripSlashesGPC($text);
		return $this->htmlSpecialChars($text);
	}

	function makeTareaData4Save($text)
	{
		return $this->addSlashes($text);
	}

	function &makeTareaData4Show(&$text, $html=1, $smiley=1, $xcode=1)
	{
		return $this->displayTarea($text, $html, $smiley, $xcode);
	}

	function makeTareaData4Edit($text)
	{
		return htmlSpecialChars($text, ENT_QUOTES);
	}
	
	function &makeTareaData4Preview(&$text, $html=1, $smiley=1, $xcode=1)
	{
		return $this->previewTarea($text, $html, $smiley, $xcode);
	}

	function makeTareaData4PreviewInForm($text)
	{
		//if magic_quotes_gpc is on, do stipslashes
		$text = $this->stripSlashesGPC($text);
		return htmlSpecialChars($text, ENT_QUOTES);
	}

	function makeTareaData4InsideQuotes($text)
	{
		return $this->htmlSpecialChars($text);
	}

	function oopsStripSlashesGPC($text)
	{
		return $this->stripSlashesGPC($text);
	}

	function oopsStripSlashesRT($text)
	{
		if (get_magic_quotes_runtime()) {
			$text = stripslashes($text);
		}
		return $text;
	}

	function oopsAddSlashes($text)
	{
		return $this->addSlashes($text);
	}

	function oopsHtmlSpecialChars($text)
	{
		return $this->htmlSpecialChars($text);
	}

	function oopsNl2Br($text)
	{
		return $this->nl2br($text);
	}
}
?>